Add news post about policy workshop

_posts/2021/05/2021-05-19-software-policies-workshop.md

@@ -50,4 +50,4 @@ We encourage you to join.
 
 <a href="https://mattermost.hzdr.de/signup_user_complete/?id=hxwji435it8cxect11xr9imkoc" markdown=1>**<i class="fas fa-comments"></i> &nbsp;Click here to join the Mattermost chat.**</a>{:.btn .btn-primary}
 
-**The Research Software Forum is looking forward to a productive exchange with you!**
\ No newline at end of file
+**The Research Software Forum is looking forward to a productive exchange with you!**